Most of the isotope data on this site has been obtained from the National Nuclear Data Center.
Naturally Occurring Isotopes
| Mass Number | Natural Abundance | Half-life |
| 64 | 49.17% | >= 7.0×1020 years |
| 66 | 27.73% | STABLE |
| 67 | 4.04% | STABLE |
| 68 | 18.45% | STABLE |
| 70 | 0.61% | >= 2.3×10+17 years |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 54 | 1.59 milliseconds | Double Proton Emission | 92% |
| 55 | 19.8 milliseconds | Electron Capture | 100.0% |
| Electron Capture with delayed Proton Emission | 91.0% | ||
| 56 | 30.0 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 86.00% | ||
| 57 | 38 milliseconds | Electron Capture with delayed Proton Emission | >= 65.00% |
| Electron Capture | 100.00% | ||
| 58 | 86 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | < 3.00% | ||
| 59 | 182.0 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.10% | ||
| 60 | 2.38 minutes | Electron Capture | 100.00% |
| 61 | 89.1 seconds | Electron Capture | 100.00% |
| 61m | < 430 milliseconds | Isomeric Transition | No Data Available |
| 61m1 | 0.14 seconds | Isomeric Transition | No Data Available |
| 61m2 | < 0.13 seconds | Isomeric Transition | No Data Available |
| 62 | 9.186 hours | Electron Capture | 100.00% |
| 63 | 38.47 minutes | Electron Capture | 100.00% |
| 64 | >= 7.0×1020 years | Double Electron Capture | No Data Available |
| 65 | 243.93 days | Electron Capture | 100.00% |
| 66 | STABLE | - | - |
| 67 | STABLE | - | - |
| 68 | STABLE | - | - |
| 69 | 56.4 minutes | Beta-minus Decay | 100.00% |
| 69m | 13.76 hours | Isomeric Transition | 99.97% |
| Beta-minus Decay | 0.03% | ||
| 70 | >= 2.3×10+17 years | Double Beta-minus Decay | No Data Available |
| 71 | 2.45 minutes | Beta-minus Decay | 100.00% |
| 71m | 3.96 hours | Beta-minus Decay | 100.00% |
| Isomeric Transition | <= 0.05% | ||
| 72 | 46.5 hours | Beta-minus Decay | 100.00% |
| 73 | 23.5 seconds | Beta-minus Decay | 100.00% |
| 73m | 5.8 seconds | Beta-minus Decay | No Data Available |
| Isomeric Transition | No Data Available | ||
| 73m1 | 13.0 milliseconds | Isomeric Transition | 100.00% |
| 74 | 95.6 seconds | Beta-minus Decay | 100.00% |
| 75 | 10.2 seconds | Beta-minus Decay | 100.00% |
| 76 | 5.7 seconds | Beta-minus Decay | 100.00% |
| 77 | 2.08 seconds | Beta-minus Decay | 100.00% |
| 77m | 1.05 seconds | Isomeric Transition | > 50.00% |
| Beta-minus Decay | < 50.00% | ||
| 78 | 1.47 seconds | Beta-minus Decay | 100.00% |
| 79 | 0.995 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 1.30% | ||
| 80 | 0.54 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 1.00% | ||
| 81 | 304 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 7.50% | ||
| 82 | > 150 nanoseconds | Beta-minus Decay | No Data Available |
| 83 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 84 | > 633 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Double Neutron Emission | No Data Available | ||
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 85 | > 637 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 85m | 637 nanoseconds | Beta-minus Decay with delayed Neutron Emission (suspected) | No Data Available |
| 85m1 | > 637 nanoseconds | Beta-minus Decay with delayed Double Neutron Emission (suspected) | No Data Available |
This page is maintained by Steve Gagnon.